Pull rod assembly

Abstract

The utility model provides a pull rod assembly, and belongs to the technical field of automobile accessories. The problems that when an existing pull rod assembly is assembled, positioning is accurate, assembling operation is smooth, and compatibility is not achieved are solved. The pull rod assembly comprises a pull rod and a ball joint, the ball joint comprises a ball shell and a ball pin, the ball shell is provided with a fixing seat, the fixing seat is fixedly connected with the pull rod through a fastener, the fastener comprises three bolts, the fixing seat is provided with a first through hole, a second through hole and a third through hole, and the three bolts can penetrate through the first through hole, the second through hole and the third through hole respectively and are arranged in a triangular shape. The first through hole and the second through hole are round holes, the third through hole is a kidney-shaped hole, the aperture of the second through hole is larger than that of the first through hole, the length of the short axis of the third through hole is equal to the aperture of the first through hole, the long axis of the third through hole faces the first through hole, and the large diameters of the screw rod sections of the three bolts are equal to the aperture of the first through hole. According to the pull rod assembly, the ball joint and the pull rod can be accurately positioned when being assembled, and the assembly operation is smoothly carried out.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts and relates to a pull rod assembly. Background Art

[0002] A suspension is a general term for the force transmission connection device between the wheels and the body of an automobile. Its function is to transmit the force and torque between the wheels and the body, buffer the impact force transmitted from the uneven road surface to the body, and reduce the resulting vibration to ensure that the automobile can drive smoothly. The suspension includes elastic elements, shock absorbers and force transmission devices, which play the roles of buffering, shock absorption and force transmission respectively.

[0003] The elastic element supports the vertical load, alleviates and suppresses the vibration and impact caused by the uneven road surface. The main elastic elements include leaf springs, coil springs, torsion bar springs, air springs and rubber springs, etc. The shock absorber is used to suppress the shock when the spring rebounds after absorbing shock and the impact from the road surface. It is widely used in automobiles to accelerate the attenuation of the vibration of the frame and the body, so as to improve the ride comfort of the automobile. The force transmission device includes control arms and pull rods, etc. One end of the pull rod is provided with a ball joint, and the other end of the pull rod is provided with a bushing assembly or a ball joint.

[0004] For example, a ball joint is publicly proposed in the Chinese patent literature [Application No.: CN 201620582282.5; Publication No.: CN 205689586 U], which includes a ball pin, a seat body and a ball joint assembly seat integrally provided with the seat body. The ball joint assembly seat is provided with three fixing positions, and the connecting lines of the center points of the three fixing positions form an isosceles triangle fixing position. Each fixing position is provided with a through hole, and a fixing bolt or a fixing screw is passed through the through hole. The seat body is located on the central axis of the isosceles triangle.

[0005] Threaded holes corresponding to the three through holes one by one are provided at the end of the pull rod. After the fixing bolt or the fixing screw passes through the through hole, it is threadedly connected with the threaded hole, and the above-mentioned ball joint is installed and fixed on the end of the pull rod through three fixing bolts or fixing screws to form a pull rod assembly. The three fixing positions form a triangular structure, making the installation and fixing stable. However, when assembling, it is necessary to align the three through holes with the three threaded holes one by one. Due to the existence of position errors, the three through holes and the three threaded holes often cannot be fully aligned during assembly, which easily causes jamming when some fixing bolts or fixing screws are inserted into the through holes and the threaded holes, and is not conducive to the smooth progress of assembly. The currently commonly used solution is to enlarge the diameters of the three through holes to eliminate the position errors, but this will cause inaccurate positioning positions of the ball joint on the pull rod, affecting the quality of the product. Summary of the Utility Model

[0006] The object of the present utility model is to address the above problems existing in the prior art and propose a pull rod assembly, and the technical problem to be solved is how to accurately position the ball joint when assembling it with the pull rod and enable the assembly operation to proceed smoothly.

[0007] The object of the present utility model can be achieved by the following technical solutions:

[0008] A pull rod assembly includes a pull rod and a ball joint. The ball joint includes a ball head shell and a ball head pin inserted into the ball head shell. The ball head shell has a fixed seat, and the fixed seat is fixedly connected to the pull rod through fasteners. The fasteners include three bolts. The fixed seat is provided with a first through hole, a second through hole, and a third through hole for the three bolts to pass through respectively and arranged in a triangular pattern. The first through hole and the second through hole are both circular holes, the third through hole is an oval hole, the aperture of the second through hole is larger than that of the first through hole, the short axis length of the third through hole is equal to the aperture of the first through hole, and the long axis of the third through hole is arranged towards the first through hole. The major diameters of the threaded rod sections of the three bolts are all equal to the aperture of the first through hole.

[0009] The pull rod is provided with a first threaded hole, a second threaded hole, and a third threaded hole that are respectively threadedly connected to the three bolts. When assembling the ball joint and the pull rod, the three bolts are respectively passed through the first through hole, the second through hole, and the third through hole. The fixed seat abuts against the pull rod, and the first through hole, the second through hole, and the third through hole are respectively aligned with the first threaded hole, the second threaded hole, and the third threaded hole. The bolt in the first through hole is screwed into the first threaded hole of the pull rod. Since the major diameter of the threaded rod section of the bolt is equal to the aperture of the first through hole, the cooperation between the bolt and the first through hole functions as a locating pin, realizing the preliminary positioning of the ball joint on the pull rod. Since the short axis length of the third through hole is equal to the aperture of the first through hole, the long axis of the third through hole is arranged towards the first through hole, and the major diameter of the threaded rod section of the bolt is equal to the aperture of the first through hole, the bolt in the third through hole can be moved along the long axis direction of the third through hole to eliminate the influence of the position error between the third through hole and the third threaded hole, enabling the bolt in the third through hole to be smoothly screwed into the third threaded hole of the pull rod, and at the same time positioning by the wall surface of the hole in the short axis direction of the third through hole abutting against the threaded rod section of the bolt. At this time, by using the cooperation between the first through hole and the bolt and the cooperation between the third through hole and the bolt, the ball joint has been completely positioned on the pull rod, making the positioning of the ball joint accurate. Since the aperture of the second through hole is larger than that of the first through hole, and the major diameter of the threaded rod section of the bolt is equal to the aperture of the first through hole, the bolt in the second through hole can be moved in the second through hole to eliminate the influence of the position error between the second through hole and the second threaded hole, enabling the bolt in the second through hole to be smoothly screwed into the second threaded hole of the pull rod. Finally, the three bolts are tightened to stably fix the ball joint on the pull rod. Therefore, this pull rod assembly can accurately position the ball joint when assembling it with the pull rod and enable the assembly operation to proceed smoothly.

[0010] In the above-mentioned pull rod assembly, the major axis length of the third through hole is equal to the aperture diameter of the second through hole, and the aperture diameter of the second through hole differs from that of the first through hole by 1 mm - 3 mm.

[0011] This can limit the movement range of the bolt in the third through hole and the second through hole, avoid the problem that the bolt cannot be smoothly connected to the corresponding threaded hole due to excessive movement of the bolt, ensure the smooth formation of a threaded connection between the bolt and the pull rod, and enable the smooth assembly of the hinge joint and the pull rod.

[0012] In the above-mentioned pull rod assembly, positioning bosses are provided at the orifices of the first through hole, the second through hole, and the third through hole on the surface of the fixed seat facing the pull rod. The end face of the positioning boss is a plane and abuts against the pull rod.

[0013] The setting of the positioning boss can, on the one hand, appropriately increase the thickness of the fixed seat, improve the structural strength of the fixed seat, and make the ball hinge joint stably fixed on the pull rod; on the other hand, through the abutment of the positioning boss and the pull rod, a stable positioning is formed between the ball hinge joint and the pull rod in the axial direction of the bolt, which is conducive to accurate positioning and stable connection between the ball hinge joint and the pull rod.

[0014] In the above-mentioned pull rod assembly, locking bosses are provided at the orifices of the first through hole, the second through hole, and the third through hole on the surface of the fixed seat facing away from the pull rod. Several protruding projections are provided on the end faces of the locking bosses, and the head of the bolt abuts against the projections.

[0015] The locking boss can appropriately increase the thickness of the fixed seat, improve the structural strength of the fixed seat, and make the ball hinge joint stably fixed on the pull rod. The setting of the projections on the locking boss has an anti-slip effect on the bolt, makes the bolt stably fixed on the pull rod assembly, and makes the connection between the ball hinge joint and the pull rod stable.

[0016] In the above-mentioned pull rod assembly, grooves are provided at the connections of the end faces of each locking boss with the outer sides of the projections. The setting of the grooves can reduce the stress concentration at the connection of the outer side of the projection and the end face of the locking boss, and make the projection structure stable.

[0017] In the above-mentioned pull rod assembly, protruding ribs are provided on the outer side surface of the fixed seat. The ribs function as reinforcing ribs, can improve the structural strength of the fixed seat, and make the ball hinge joint stably fixed on the pull rod.

[0018] In the above-mentioned drawbar assembly, the fastener further includes three nuts, and the three bolts respectively pass through the fixed seat and the drawbar and are threadedly connected to the three nuts. The nuts and bolts are standard parts and can be directly purchased. The fixation of the fixed seat and the drawbar is achieved through the cooperation of the nuts and bolts, which can reduce the machining of threaded holes on the drawbar, facilitate the simplification of the machining process, and reduce the machining cost.

[0019] Compared with the prior art, the present utility model has the following advantages:

[0020] On the fixed seat of the ball hinge joint, the first through hole and the second through hole are both circular holes, the third through hole is a kidney-shaped hole, the aperture of the second through hole is larger than that of the first through hole, the short axis length of the third through hole is equal to the aperture of the first through hole, and the long axis of the third through hole is arranged towards the first through hole. The major diameters of the three bolt screw segments are all equal to the aperture of the first through hole, so that the assembly of the ball hinge joint and the drawbar is positioned through the first through hole and the second through hole, and the position error is eliminated through the second through hole and the third through hole, ensuring accurate positioning and smooth assembly operation when the ball hinge joint and the drawbar are assembled. Description of the Drawings

[0021] Figure 1 is a cross-sectional view of the first embodiment of this drawbar assembly.

[0022] Figure 2 is Figure 1 a cross-sectional view taken along the A-A direction in

[0023] Figure 3 is a top view of the ball hinge joint in the first embodiment of this drawbar assembly.

[0024] Figure 4 is Figure 3 a partial cross-sectional view taken along the B-B direction in

[0025] Figure 5 is a cross-sectional view of the second embodiment of this drawbar assembly.

[0026] In the figure, 1. Drawbar; 1a. Connection hole; 2. Ball hinge joint; 2a. Ball head shell; 2a1. Fixed seat; 2a1a. Rib; 2a1b. First through hole; 2a1c. Second through hole; 2a1d. Third through hole; 2a1e. Positioning boss; 2a1f. Locking boss; 2a1g. Protrusion; 2a1h. Groove; 2b. Ball head pin; 2c. Ball head seat; 2d. Dust cover; 2e. Protective cover; 3. Bolt; 4. Nut. Detailed Embodiment

[0027] The following are specific embodiments of the present utility model in combination with the drawings, and the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0028] Embodiment 1

[0029] As Figure 1 and Figure 2 shown, a pull rod assembly includes a pull rod 1 and a ball joint 2. The ball joint 2 is fixedly connected to the end of the pull rod 1. The ball joint 2 includes a ball head shell 2a, a ball head pin 2b, and a ball head seat 2c. The ball head seat 2c is fixed inside the ball head shell 2a. The spherical portion of the ball head pin 2b is inserted into the ball head seat 2c. The rod portion of the ball head pin 2b extends out of the ball head shell 2a. A dust cover 2d is connected between the rod portion of the ball head pin 2b and the ball head shell 2a. A protective cover 2e is sleeved on the outer side of the dust cover 2d. The ball head shell 2a has a fixed seat 2a1, and a protruding rib 2a1a is provided on the outer side surface of the fixed seat 2a1. The fixed seat 2a1 and the pull rod 1 are fixedly connected by fasteners. The fasteners include three bolts 3. Combining Figure 3 shown, the fixed seat 2a1 is provided with a first through hole 2a1b, a second through hole 2a1c, and a third through hole 2a1d for the three bolts 3 to pass through respectively and arranged in an isosceles triangle. The first through hole 2a1b and the third through hole 2a1d are located at the bottom of the isosceles triangle, and the second through hole 2a1c is located at the top of the isosceles triangle. The first through hole 2a1b and the second through hole 2a1c are both circular holes, and the third through hole 2a1d is a waist-shaped hole. The aperture of the second through hole 2a1c is larger than the aperture of the first through hole 2a1b, and the difference between the aperture of the second through hole 2a1c and the aperture of the first through hole 2a1b is 1 mm - 3 mm. The short axis length of the third through hole 2a1d is equal to the aperture of the first through hole 2a1b. The long axis of the third through hole 2a1d is set in the direction towards the first through hole 2a1b, and the long axis length of the third through hole 2a1d is equal to the aperture of the second through hole 2a1c. The major diameters of the screw rod segments of the three bolts 3 are all equal to the aperture of the first through hole 2a1b. For example, the major diameter of the screw rod segments of the three bolts 3 is 12 mm, the aperture of the first through hole 2a1b is 12 mm, the aperture of the second through hole 2a1c is 14 mm, the short axis length of the third through hole 2a1d is 12 mm, and the long axis length of the third through hole 2a1d is 14 mm. Three connecting holes 1a are provided on the pull rod 1. The three connecting holes 1a are all threaded holes and are respectively threadedly connected to the three bolts 3. The three connecting holes 1a are respectively a first threaded hole, a second threaded hole, and a third threaded hole corresponding to the first through hole 2a1b, the second through hole 2a1c, and the third through hole 2a1d one by one. The three connecting holes 1a can be through holes or blind holes.

[0030] As Figure 1 、 Figure 3 and Figure 4As described above, positioning bosses 2a1e are provided at the orifices of the first through hole 2a1b, the second through hole 2a1c, and the third through hole 2a1d on the surface of the fixed seat 2a1 facing the pull rod 1. The end face of the positioning boss 2a1e is a plane and abuts against the pull rod 1. Locking bosses 2a1f are provided at the orifices of the first through hole 2a1b, the second through hole 2a1c, and the third through hole 2a1d on the surface of the fixed seat 2a1 facing away from the pull rod 1. A plurality of protruding protrusions 2a1g are provided on the end faces of the locking bosses 2a1f. The head of the bolt 3 abuts against the protrusions 2a1g. In this embodiment, five protrusions 2a1g are provided on each locking boss 2a1f, and the number of protrusions 2a1g can be appropriately increased or decreased, such as four or six, etc. Grooves 2a1h are provided at the connections of the end faces of each locking boss 2a1f with the outer sides of the protrusions 2a1g.

[0031] When assembling the spherical hinge joint 2 and the tie rod 1, pass the three bolts 3 through the first through hole 2a1b, the second through hole 2a1c, and the third through hole 2a1d respectively. The positioning boss 2a1e of the fixed seat 2a1 abuts against the tie rod 1, and the first through hole 2a1b, the second through hole 2a1c, and the third through hole 2a1d are respectively aligned with the first threaded hole, the second threaded hole, and the third threaded hole. The bolt 3 in the first through hole 2a1b is screwed into the first threaded hole of the tie rod 1. Since the major diameter of the screw rod section of the bolt 3 is equal to the aperture of the first through hole 2a1b, the cooperation between the bolt 3 and the first through hole 2a1b functions as a positioning pin, realizing the preliminary positioning of the spherical hinge joint 2 on the tie rod 1. Since the minor axis length of the third through hole 2a1d is equal to the aperture of the first through hole 2a1b, and the major axis of the third through hole 2a1d is arranged towards the first through hole 2a1b, and the major diameter of the screw rod section of the bolt 3 is equal to the aperture of the first through hole 2a1b, the bolt 3 in the third through hole 2a1d can be moved along the major axis direction of the third through hole 2a1d to eliminate the influence of the position error between the third through hole 2a1d and the third threaded hole, so that the bolt 3 in the third through hole 2a1d can be smoothly screwed into the third threaded hole of the tie rod 1, and at the same time, positioning is performed by the hole wall surface in the minor axis direction of the third through hole 2a1d abutting against the screw rod section of the bolt 3. At this time, by using the cooperation between the first through hole 2a1b and the bolt 3 and the cooperation between the third through hole 2a1d and the bolt 3, the spherical hinge joint 2 has been completely positioned on the tie rod 1, making the positioning of the spherical hinge joint 2 accurate. Since the aperture of the second through hole 2a1c is larger than the aperture of the first through hole 2a1b, and the major diameter of the screw rod section of the bolt 3 is equal to the aperture of the first through hole 2a1b, the bolt 3 in the second through hole 2a1c can be moved in the second through hole 2a1c to eliminate the influence of the position error between the second through hole 2a1c and the second threaded hole, so that the bolt 3 in the second through hole 2a1c can be smoothly screwed into the second threaded hole of the tie rod 1. Finally, tighten the three bolts 3 to stably fix the spherical hinge joint 2 on the tie rod 1. Therefore, this tie rod assembly can accurately position the spherical hinge joint 2 during the assembly with the tie rod 1 and the assembly operation can proceed smoothly.

[0032] Embodiment 2

[0033] As Figure 5 shown, compared with Embodiment 1, the difference is that: the fasteners include three bolts 3 and three nuts 4. After passing through the fixed seat 2a1 and the tie rod 1, the three bolts 3 are respectively threadedly connected to the three nuts 4. The three connection holes 1a on the tie rod 1 are all through holes, and the three connection holes 1a can be threaded holes or clearance holes. When the connection hole 1a is a clearance hole, the hole wall surface of the connection hole 1a and the outer side surface of the screw rod section of the bolt 3 are in clearance fit. Other structures are the same as those in Embodiment 1.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but they will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A tie rod assembly, comprising a tie rod (1) and a ball joint (2), wherein the ball joint (2) comprises a ball head shell (2a) and a ball head pin (2b) inserted into the ball head shell (2a), wherein the ball head shell (2a) has a fixing seat (2a1), wherein the fixing seat (2a1) is fixedly connected to the tie rod (1) by a fastener, wherein the fastener comprises three bolts (3), wherein the fixing seat (2a1) is provided with a first through hole (2a1b), a second through hole (2a1c) and a third through hole (2a1d) arranged in a triangle and through which the three bolts (3) are respectively passed, wherein the fixing seat (2a1) is provided with: The first through hole (2a1b) and the second through hole (2a1c) are both circular holes, the third through hole (2a1d) is a waist-shaped hole, the aperture of the second through hole (2a1c) is larger than the aperture of the first through hole (2a1b), the minor axis length of the third through hole (2a1d) is equal to the aperture of the first through hole (2a1b), and the major axis of the third through hole (2a1d) is arranged in a direction toward the first through hole (2a1b), and the major diameters of the screw rod sections of the three bolts (3) are all equal to the aperture of the first through hole (2a1b).

2. The tie rod assembly according to claim 1, characterized in that: The major axis length of the third through hole (2a1d) is equal to the aperture of the second through hole (2a1c), and the aperture of the second through hole (2a1c) differs from the aperture of the first through hole (2a1b) by 1mm-3mm.

3. The tie rod assembly according to claim 1, characterized in that: Positioning bosses (2a1e) are provided on the surface of the fixing seat (2a1) facing the pull rod (1) at the openings of the first through hole (2a1b), the second through hole (2a1c) and the third through hole (2a1d); the end faces of the positioning bosses (2a1e) are plane and abut against the pull rod (1).

4. The tie rod assembly according to any one of claims 1 to 3, characterized in that: A locking boss (2a1f) is provided on the side of the fixing seat (2a1) facing away from the pull rod (1) at the openings of the first through hole (2a1b), the second through hole (2a1c) and the third through hole (2a1d), and the end faces of the locking bosses (2a1f) have a plurality of protruding projections (2a1g), and the heads of the bolts (3) abut against the projections (2a1g).

5. The tie rod assembly according to claim 4, characterized in that: A groove (2a1h) is provided on the end surface of each locking boss (2a1f) at the location where it connects with the outer side surface of the protrusion (2a1g).

6. The tie rod assembly according to any one of claims 1 to 3, characterized in that: The outer side surface of the fixing seat (2a1) is provided with a protruding convex strip (2a1a).

7. The tie rod assembly according to any one of claims 1 to 3, characterized in that: The fastener also includes three nuts (4), and the three bolts (3) are threadedly connected to the three nuts (4) respectively after passing through the fixing seat (2a1) and the pull rod (1).

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